add LDAP authentication

app/controllers/sessions_controller.rb

@@ -16,6 +16,8 @@
 
 class SessionsController < ApplicationController
 
+  skip_before_filter :verify_authenticity_token
+
   def new
   end
 

app/models/user.rb

@@ -47,6 +47,14 @@ class User < ApplicationRecord
     auth_hash['info']['email']
   end
 
+  def self.ldap_username(auth_hash)
+    auth_hash['info']['nickname']
+  end
+  
+  def self.ldap_email(auth_hash)
+    auth_hash['info']['email']
+  end
+
   def set_encrypted_id
     self.encrypted_id = "#{username[0..1]}-#{Digest::SHA1.hexdigest(uid+provider)[0..7]}"
   end

app/views/sessions/new.erb

@@ -49,6 +49,18 @@
                 </div>
               <% end %>
           <% end %>
+          <% if omniauth_providers_configured(:ldap) %>
+              <%= link_to omniauth_login_url(:ldap), class: "signin-link signin-link-ldap" do %>
+                <div class="signin-button center-block">
+                  <div class="signin-icon-wrapper">
+                    <%= image_tag(ENV['LDAP_ICON'].present? ? ENV['LDAP_ICON'] : 'ldap_icon.png', alt: "L", class: "signin-icon") %>
+                  </div>
+                  <div class="signin-text-wrapper text-center">
+                    <span class="signin-text"><%= t('signin_text', provider: ENV['LDAP_NAME'].present? ? ENV['LDAP_NAME'] : 'LDAP') %></span>
+                  </div>
+                </div>
+              <% end %>
+          <% end %>
         </div>
       <% end %>
     </div>